That's a bit of unclear verbiage on my end, the regular teleporters go back to their area's hub, the hubs themselves are what let you teleport between areas.
so I'd have to make a teleporter hub in the overworld and underground? Does it have to be on the top layer and exposed to sunlight or how does it work? the wording is very confusing
No special requirements after the initial fall into the caverns and destruction of the interference nodes. Just build/power a teleporter hub and you can use it to teleport to the surface. The same applies if you ever want to back down to the caverns after you get out of them the first time.
